Calculating with Bond Energy - B

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Problem

In the problem below, X, Y, and Z represent the symbols of three unknown elements. The following list gives the bond strengths of three diatomic molecules associated with the unknown elements X, Y, and Z at 25 degrees C:

AB = 30.1 kcal/mole       CD = 73.7 kcal/mole 

AD = 61.4 kcal/mole.       CB = 15.9 kcal/mole. 

Based on this bond strength information, calculate the value of Q in the following thermochemical equation:

     AB (g) + CD (g) ---> AD (g) + CB (g) Q = ? kcal @ 25 degrees C